问题描述: My mother was busy_?_the housework when i got home横线上填什么,要说明理由 1个回答 分类:英语 2014-12-10 问题解答: 我来补答 doing句意为当我到家时,我妈妈正在忙于做家务.be busy doing为固定搭配. 展开全文阅读